Malicious PDF — malware analysis report

Static analysis result for SHA-256 71aab363ef6f50fe…

MALICIOUS

PDF

44.7 KB Created: 2021-06-03 05:13:52 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-09-15
MD5: f8c473b62b592b7ddcedf3a3a0e30b2d SHA-1: 22697fe76c4226b30ad88321555bab7a168cf35b SHA-256: 71aab363ef6f50fe45c1666cef8b0cd91dd044d41a8dd1eade3fb76be79ea9a0
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains multiple links, including one identified as a malicious redirector, which is designed to lure users into clicking on it for game-related cheats. The ML classifier strongly flagged this PDF as malicious, and the presence of a download button lure further supports a malicious intent. The embedded links likely lead to further stages of infection or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9865

Heuristics 4

  • PDF links to a 'free generator / game hack' redirector critical PDF_GAME_HACK_REDIRECT_LURE
    PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean. CRITICAL on its own: the /app/<id>/<slug>-game-hack path shape is unambiguous scam infra, and the host rotates so a host-list match can't be relied on.
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://netcdn.online/app/406889139/free-coins-and-spins-for-coin-master-game-hack In PDF document text
    • https://imagetravelnepal.com/userfiles/files/free-robux-hack_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/free-robux-no-human-verification-or-survey-2021_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/how-to-change-roblox-name-for-free_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/how-to-get-free-daily-spins-on-coin-master_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/coin-master-app_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/coin-master-free-spins-daily_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/roblox-pink-free-robux_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/coin-master-daily-free-coins-link_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/can-i-play-minecraft-for-free_GM479516143.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/roblox-fly-hack_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/minecraft-fly-hack_GM479516143.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/free-robux-with-no-survey_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/roblox-troll-outfits-free_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/free-robux-scams_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/games-that-give-free-robux_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/coin-master-hack-spin-160-pro_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/inappropriate-roblox-games-2021_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/free-roblox-premium_GM431946152.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/coin-master-free-card-link-today_GM406889139.pdfIn PDF document text
    • https://imagetravelnepal.com/userfiles/files/my-robux_GM431946152.pdfIn PDF document text
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off0000522a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x522A 25976 bytes
SHA-256: 87f740d74a908298c476f6463aa0376864a37c54b644e5f8ac8ef362086a4158
font_01_sfnt_off00008cb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x8CB3 18060 bytes
SHA-256: f1068137021f01f6b5cc3550273fdf5362b49e27ffe305b66dd7920a08d48120

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